Angles In Circles Tutorial for calculating angles in circles formed from radii, chords, tangents and secants.
Calculator for Constructing Regular Polygons
Draw a circle, measure the radius and this calculates the length of the polygon's sides.
Central Angle Calculator Calculates Central Angle of a Circle, Radius or Arc Length
Circle Circumference & Area
CIRCLE Sector, Segment, Chord, & Arc
Circle Equation Tutorial
Explains equations of the type x² + y² = r²
Circle Equation Calculator
Input 3 points and it calculates a circle's center radius and equation.
Types of Triangles
A chart showing triangles classified by angles
(acute, right, obtuse) and by sides (equilateral, isosceles, scalene).
Also has triangle area formulas and a triangle area calculator.
A tutorial discussing the incenter, circumcenter, centroid, orthocenter and the Euler line.
Calculates if 3 sides will form a triangle or not.
Right Triangles (Pythagorean Theorem)
30 60 90 and 45 45 90 Triangle Calculator
Quadrilateral page Descriptions and graphics discussing 6 different types of quadrilaterals.
How to Calculate Trapezoid Area
Calculator for Parallelograms Squares Rectangles Rhombuses
Quadrilateral Kite Calculator